Re: chrysler 140hp help australia
If the prop locks in gear both directions, that means the gears are engaged. It is, however possible for a 140 to strip the gears out of an 85 gearbox IF--If the gearbox is a 2-1 ratio. The teeth are much smaller than those in the 1.76 ratio. My 140 DID, after a few years of use, strip the gears. BUT, in that case, It stripped ALL the teeth, not just one or two. It did not lock the prop in either gear and in fact, it was a witch to disassemble because the metal chips locked the bearing carrier into the case.
You were given a prop of which you don't know the history. It is MORE LIKELY that the rubber hub has "spun" When these props spin a hub, most times you can not feel it when turning by hand and it will lock into gear. However, when the engine is put into the water, it may (depending upon the degree of slipping) have zero thrust, even at idle speed or may be able to idle around and slip at higher speeds.
SO: First, remove the prop and using a Magic Marker mark the back and front of the prop and hub with a straight line. Now replace the prop and run the engine in the water. Remove the prop again and look at the line. If it is now broken, indicating the hub has moved, the hub is spun.
You can install a new hub, best solution, try glueing the existing hub with a high quality industrial rubber glue, worst solution, or "pinning" the hub with about 4 set screws, not so good on this type of hub because of the thinness.
The photo is a pinned bronze 10 inch prop for a 50 HP engine. As I said, pinning your prop is a little more difficult because of the thinness of the bronze insert in the rubber hub, but it is still do-able. Go back a ways in this thread and look at the photos of installation of a hub.
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